Ethereal-users: [Ethereal-users] Q931 over TCP

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From: "Mike Ollington" <mike@xxxxxxxxxx>
Date: Wed, 12 Jul 2006 07:50:26 +0100
Hello,
 
I have a capture with 802.1q VLAN tags taken between an Avaya IP handset and an Avaya Call Manager and I'm trying to understand call setup.  I presumed this was H323 (tcp 1720) and tried the two `decode as' options only to produce nonsense and assumed that it was proprietory.
 
By chance, I opened the same trace in Wildpackets Omnipeek, which identified the traffic as TPKT and Q931 and within this I could see call setup data.  When I attempt to `decode as' the traffic as TPKT, Ethereal doesn't realise there is Q931 in there with the info showing an unknown TPDU type (0x0).
 
Am I doing something wrong?  Is there a way to decode directly as Q931 rather than relying on the TPKT dissector to work it out?
 
Thanks,
Mike

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